| Σ | # | Presentation | Description | Related |
| 6 | 104 | ⟨a, b | aaba=bb⟩ | Infinite cancellative non-commutative monoid | |
| 7 | 145 | ⟨a, b | aababba=1⟩ | Infinite non-Abelian group | 22 iso, 22 anti-iso |
| 7 | 193 | ⟨a, b | ababba=b⟩ | Infinite cancellative non-commutative monoid | |
| 9 | 842 | ⟨a, b | abaababa=b⟩ | Infinite cancellative non-commutative monoid | |
| 9 | 1126 | ⟨a, b | ababba=bab⟩ | Infinite cancellative non-commutative monoid | |
| 9 | 1273 | ⟨a, b | abbba=babb⟩ | Infinite cancellative non-commutative monoid | |
| 10 | 2633 | ⟨a, b | abbbba=babb⟩ | Infinite cancellative non-commutative monoid | |
| 11 | 3716 | ⟨a, b | abaaabaaba=b⟩ | Infinite cancellative non-commutative monoid | |
| 11 | 4876 | ⟨a, b | abbabbba=bab⟩ | Infinite cancellative non-commutative monoid | |
| 11 | 5415 | ⟨a, b | abbbbba=babb⟩ | Infinite cancellative non-commutative monoid | |
| 11 | 5898 | ⟨a, b | ababba=babab⟩ | Infinite cancellative non-commutative monoid | |